JP6867021B2 - Overload detector, power transmission control device, overload detection method, and program - Google Patents

Description

The present invention relates to an overload detection device, a method, and a program, and more particularly to an overload detection device, a method, and a program for detecting an overload state of a transmission line.

The present invention also relates to a power transmission control device that controls power transmission of the power transmission line.

Devices that protect transmission lines from overcurrent (overload) are known. For example, Patent Document 1 describes a device that measures a current flowing through a transmission line and detects an overload state when the measured current exceeds a predetermined set value. Further, Patent Document 2 describes a device that calculates the conductor temperature of a transmission line based on the current flowing through the transmission line and the ambient temperature of the transmission line, and detects an overload state when the conductor temperature exceeds a predetermined set value. Is described.

Here, a generator that generates electricity using renewable energy such as solar power or wind power may be connected to the transmission line. In general, the power generated by such a generator depends on weather conditions and the like. Regarding the power generation prediction of renewable energy, Patent Document 3 discloses that the power generation is predicted based on various meteorological conditions such as the amount of solar radiation, the wind speed, the temperature, and the amount of rainfall.

Japanese Unexamined Patent Publication No. 2004-129428 Japanese Unexamined Patent Publication No. 4-317511 Japanese Unexamined Patent Publication No. 2014-26625

In Patent Documents 1 and 2, when an overload state of a transmission line is detected, a breaker arranged between the generator and the transmission line is controlled to stop power transmission from the generator to the transmission line. By doing so, it is stated that the overload condition of the transmission line is avoided. However, in these documents, the overload state can be detected only after the fact, and the overload state cannot be detected in advance. Therefore, for example, if the current suddenly increases and the magnitude of the current exceeds the permissible value before the overload is detected, the transmission line may be damaged. Patent Document 3 merely discloses that the generated power of renewable energy is predicted, and does not provide a means for solving the above-mentioned problems.

In view of the above circumstances, it is an object of the present invention to provide an overload detection device, a power transmission control device, an overload detection method, and a program capable of detecting an overload state of a transmission line before an actual overload state occurs. And.

In order to achieve the above object, the present invention provides power generation prediction data showing a prediction result of the generated power of a generator that generates power using renewable energy and supplies power to a transmission line connected via a breaker. The power generation prediction data acquisition means for acquiring the power generation prediction data, the substation power data acquisition means for acquiring the substation power data including the data indicating the power transmitted from the substation to the transmission line, the power generation prediction data, and the substation. A section power calculation means for calculating the section power indicating the power of each divided section for each of the plurality of divided sections in which the transmission section of the transmission line is divided by the connection node of the generator based on the power data. An overload detecting device including an overload determining means for comparing the section power with the threshold value set for each divided section and determining whether or not an overload state occurs in each of the divided sections. provide.

The present invention also obtains power generation prediction data indicating a power generation prediction result of a generator that generates power using renewable energy and supplies power to a transmission line connected via a breaker. Based on the acquisition means, the substation power data acquisition means for acquiring the substation power data including the data indicating the power transmitted from the substation to the transmission line, the power generation prediction data, and the substation power data. , A section power calculation means for calculating the section power indicating the power of each divided section for each of the plurality of divided sections in which the transmission section of the transmission line is divided by the connection node of the generator, and the section power and each division. The overload determining means for comparing with the threshold value set for the section and determining whether or not an overload state occurs for each of the divided sections, and the overload determining means according to the determination result in the overload determining means. Provided is a power transmission control device including a breaker control means for controlling a breaker.

The present invention predicts the generated power of a generator that generates power using renewable energy and supplies power to a transmission line connected via a breaker, and transmits power supplied from the substation to the transmission line. The substation power data including the data indicating the above is acquired, and the transmission section of the transmission line is connected to the generator based on the power generation prediction data showing the prediction result of the generated power of the generator and the substation power data. For each of the plurality of divided sections divided by the node, the section power indicating the power of each divided section is calculated, the section power is compared with the threshold value set for each divided section, and the divided section is compared. Provided is an overload detection method for determining whether or not an overload state occurs for each of the above.

The present invention acquires power generation prediction data showing the prediction result of the generated power of a generator that generates power by using renewable energy and supplies power to a transmission line connected via a breaker to a computer, and transforms the power. Substation power data including data indicating the power transmitted from the station to the transmission line is acquired, and the transmission section of the transmission line is the generator of the generator based on the power generation prediction data and the substation power data. For each of the plurality of divided sections divided by the connection node, the section power indicating the power of each divided section is calculated, the section power is compared with the threshold value set for each divided section, and the division is performed. Provided is a program for executing a process of determining whether or not an overload state occurs for each section.

The overload detection device, the power transmission control device, the overload detection method, and the program of the present invention can detect the overload state of the transmission line before the overload state actually occurs.

The block diagram which shows the schematic power transmission control apparatus of this invention. The block diagram which shows the power transmission system including the overload detection device which concerns on one Embodiment of this invention. The block diagram which shows the structure of the transmission line overload detection device. A system diagram showing a power transmission system. The figure which shows the section power calculation formula used for the calculation of a section power. A table showing the judgment thresholds set for each division section. A system diagram showing a numerical example of section power. A table showing the section power calculation formula, calculation result, judgment threshold value, and whether or not an overload situation has occurred. A table showing the correspondence between the divided section and the generator to be cut off. A flowchart showing an operation procedure at the time of interruption. A flowchart showing the operation procedure at the time of recovery.

Prior to the description of the embodiments of the present invention, the outline of the present invention will be described. FIG. 1 shows a schematic power transmission control device (system) of the present invention. The power transmission control device 20 includes a power generation prediction data acquisition unit 11, a substation power data acquisition unit 12, a section power calculation unit 13, an overload determination unit 14, and a circuit breaker control unit 21. Among the components of the power transmission control device 20, the power generation prediction data acquisition means 11, the substation power data acquisition means 12, the section power calculation means 13, and the overload determination means 14 constitute the overload detection device 10.

The overload detection device 10 determines whether or not an overload state has occurred in a transmission line to which a generator that generates electricity using renewable energy is connected. Each generator is connected to a transmission line via a circuit breaker. The power generation prediction data acquisition means 11 acquires power generation prediction data indicating a prediction result of the generated power of a generator that generates power using renewable energy. The substation power data acquisition means 12 acquires substation power data including data indicating the power transmitted from the substation to the transmission line to which the generator is connected.

The section power calculation means 13 indicates the power of each divided section for each of the plurality of divided sections in which the transmission section of the transmission line is divided by the connection node of the generator, based on the power generation prediction data and the substation power data. Calculate the section power. The overload determining means 14 compares the calculated section power with the threshold value set for each divided section. The overload determining means 14 determines whether or not an overload state occurs for each of the divided sections based on the comparison result. The circuit breaker control means 21 controls the circuit breaker arranged between the generator and the transmission line according to the determination result in the overload determination means 14.

In the present embodiment, the power transmitted in each divided section is calculated based on the power transmitted from the substation to the transmission line and the predicted value of the generated power of the generator that generates power using renewable energy. In the present invention, by determining the presence or absence of an overload state using the predicted value of the generated power, it is possible to detect the occurrence of the overload state before the actual overload state occurs. When the occurrence of an overload state is detected, the overload state can be avoided by controlling the circuit breaker to stop the power transmission from the generator to the transmission line.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 2 shows a power transmission system including an overload detection device according to an embodiment of the present invention. This power transmission system includes a remote monitoring and control device 101, a power transmission line overload detection device 102, a power generation prediction device 103, a substation 104, and a circuit breaker 105.

The remote monitoring and control device 101 is arranged in, for example, a central control room of an electric power company or the like. The remote monitoring and control device 101 is connected to the substation 104 via a communication line, and monitors and controls the substation 104. The distant monitoring control device 101 includes, for example, a communication device that communicates with a control device installed in a distant substation 104, a display device that displays various information to the operator, an operation console that accepts the operator's operation, and various calculations and controls. Including the server to do. The remote monitoring and control device 101 also controls the operation and stop of a power plant (not shown).

The power generation prediction device 103 predicts the generated power of a generator (a power plant having such a generator) that generates power using renewable energy. The power generation prediction device 103 predicts the generated power based on meteorological conditions such as sunshine, temperature, wind speed, and rainfall. The algorithm used by the power generation prediction device 103 to predict the generated power is not particularly limited, and the power generation prediction device 103 predicts the generated power by using an arbitrary calculation method.

The transmission line overload detection device 102 detects the overload state of the transmission line connecting the substations 104. The transmission line overload detection device 102 divides the transmission line into sections for each substation 104 and a power plant (not shown), and determines whether or not an overload state occurs for each section. In the present embodiment, the transmission line overload detection device 102 uses the generated power predicted by the power generation prediction device 103 to determine whether or not an overload state occurs. When the transmission line overload detection device 102 determines that an overload state occurs, it requests the remote monitoring control device 101 to control the circuit breaker 105, and reduces the power transmitted to the transmission line.

The transmission line overload detection device 102 and the power generation prediction device 103 are configured as a computer device including, for example, a processor and a memory. The transmission line overload detection device 102 and the power generation prediction device 103 do not need to be physically separated, and may be configured as one device. Alternatively, at least one of the transmission line overload detection device 102 and the power generation prediction device 103 may be a part of the remote monitoring control device 101. The power transmission line overload detection device 102 corresponds to the overload detection device 10 of FIG. 1, and the remote monitoring control device 101 and the power transmission line overload detection device 102 correspond to the power transmission control device 20 of FIG.

FIG. 3 shows the configuration of the transmission line overload detection device 102. The transmission line overload detection device 102 includes a data reception unit 121, a data input unit 122, a data storage unit 123, a section power calculation unit 124, an overload determination unit 125, and a cutoff request unit 126. In the transmission line overload detection device 102, for example, the functions of the data reception unit 121, the section power calculation unit 124, the overload determination unit 125, and the cutoff request unit 126 can be realized by operating the computer according to the program.

The data receiving unit 121 acquires power generation prediction data indicating a prediction result of the generated power of a generator that generates power using renewable energy from the power generation prediction device 103. The power generation prediction device 103 predicts, for example, the power generated for the next day. The power generation prediction device 103 predicts the generated power in predetermined time units, for example, in units of 30 minutes, and transmits the prediction result to the transmission line overload detection device 102. The data receiving unit 121 acquires, for example, power generation prediction data that predicts the power generated on the previous day and the next day. When the prediction result of the generated power is changed on the day, the data receiving unit 121 acquires the changed power generation prediction data.

In addition, the data receiving unit 121 acquires substation power data including data indicating the power transmitted from the substation 104 (see FIG. 2) to the transmission line from the remote monitoring and control device 101. The data receiving unit 121 acquires, for example, data indicating a transmission line current from the remote monitoring and control device 101. The data receiving unit 121 acquires data indicating the current power transmission power from the remote monitoring and control device 101, for example, at a predetermined cycle. The data receiving unit 121 includes data indicating the transmitted power transmitted from the remote monitoring and control device 101 to the transmission line from the substation 104, for example, and data indicating the received power received by the substation 104 from the transmission line every 30 minutes. And get. The data receiving unit 121 functions as the power generation prediction data acquisition means 11 and the substation power data acquisition means 12 of FIG.

The data input unit 122 has various information indicating a transmission line section, a section power calculation formula, an overload determination threshold value, a generator to be shut off when an overload state occurs, a shutoff order at that time, and the like. Enter. The data input unit 122 includes an input device such as a keyboard or a pointing device. The data storage unit 123 is an auxiliary storage device such as a hard disk device, and stores power generation prediction data and substation power data acquired by the data reception unit 121, and various data input from the data input unit 122.

The section power calculation unit 124 indicates the power of each divided section for each of the plurality of divided sections in which the transmission section of the transmission line is divided by the connection node of the generator based on the power generation prediction data and the substation power data. Calculate the section power. The section power calculation unit 124 calculates the section power according to the section power calculation formula defined according to the connection relationship between the substation and the generator to the transmission line, for example. The section power calculation formula is input from the data input unit 122 and stored in the data storage unit 123. The section power calculation formula is defined for each pattern of power transmission / reception of a substation connected to a transmission line, for example.

The overload determination unit 125 determines whether or not an overload state occurs for each of the divided sections based on the section power calculated by the section power calculation unit 124. The overload determination unit 125 compares the section power with the determination threshold value set for each divided section in determining the overload state. The overload determination unit 125 determines that an overload state occurs when the section power is equal to or greater than the determination threshold value, and determines that an overload state does not occur when the section power is less than the determination threshold value. The determination threshold value is input from the data input unit 122 and stored in the data storage unit 123.

When the overload determination unit 125 determines that an overload state occurs, the circuit breaker request unit 126 transmits a circuit breaker request for the circuit breaker 105 to the remote monitoring control device 101. The remote monitoring control device 101 has means corresponding to the circuit breaker control means 21 of FIG. 1, and controls the circuit breaker (opening / closing of the circuit breaker 105) of the generator according to the circuit breaker request transmitted from the circuit breaker request unit 126. To do. When the overload determination unit 125 determines that an overload state occurs, the cutoff request unit 126 is a circuit breaker 105 corresponding to at least one of the generators connected to the divided section determined to cause the overload state. To separate at least one of the generators from the transmission line. The cutoff requesting unit 126 separates (cuts off), for example, the generators to be cut off set for each divided section based on a predetermined cutoff order.

In the above description, an example in which the transmission line overload detection device 102 acquires the substation power data from the remote monitoring control device 101 has been described, but the present invention is not limited to this, and the transmission line overload detection device 102 is the substation 104. Power data may be collected from. Further, in the above description, an example in which the transmission line overload detection device 102 opens and closes the circuit breaker 105 through the remote monitoring control device 101 has been described, but the present invention is not limited to this. The transmission line overload detection device 102 may have a means corresponding to the circuit breaker control means 21, and may control the opening and closing of the circuit breaker 105 without going through the remote monitoring control device 101.

FIG. 4 shows a power transmission system. Here, consider the substation A141 and the substation B142 as the substation 104 (see FIG. 2), and consider the case where the substation A141 and the substation B142 are connected by two transmission lines 171 and 172. .. The connection node between the substation A141 and the transmission line 171 is AL1, and the connection node between the substation B142 and the transmission line 171 is BL1. Further, the connection node between the substation A141 and the transmission line 172 is AL2, and the connection node between the substation B142 and the transmission line 172 is BL2.

The substation A141 and the substation B142 are also connected to other substations and power plants (not shown). Substation A141 and substation B142 receive power from other substations and power plants, respectively, and transmit the supplied power to transmission lines 171 and 172. Alternatively, the substation A141 and the substation B142 receive electric power via the transmission lines 171 and 172, and supply the received electric power to another substation or the like via another transmission line or the like.

A generator (G1) 161 and a generator (G2) 162 that generate electricity using renewable energy are connected to the transmission line 171 via the corresponding circuit breaker (CB1) 151 and the circuit breaker (CB2) 152. To. The connection node between the transmission line 171 and the generator 161 is g1, and the connection node between the transmission line 171 and the generator 162 is g2. On the other hand, in the transmission line 172, a generator (G3) 163 and a generator (G4) 164 that generate electricity using renewable energy are transmitted via the corresponding circuit breaker (CB3) 153 and the circuit breaker (CB4) 154. Be connected. The connection node between the transmission line 172 and the generator 163 is g3, and the connection node between the transmission line 172 and the generator 164 is g4.

In the above case, the transmission section between the substation A141 and the substation B142 of the transmission line 171 is divided into three sections of nodes AL1 to g1, nodes g1 to g2, and nodes g2 to BL2. Further, the transmission section between the substation A141 and the substation B142 of the transmission line 172 is divided into three sections of nodes AL2 to g3, nodes g3 to g4, and nodes g4 to BL2. The section power calculation unit 124 (see FIG. 3) calculates the section power in these six sections (divided sections).

Although a simplified system diagram is shown in FIG. 4 for simplification of explanation, the power transmission system may be more complicated. For example, the transmission line may have a branch point in the middle, and the electric power transmitted from a certain substation may be received by two substations.

FIG. 5 shows a section power calculation formula used for calculating the section power. As a premise, it is assumed that there is at least one substation that transmits power to a certain transmission line and that there is at least one substation that receives power from that transmission line. When the power of the substation node is "+" (a positive number including 0), it indicates that the substation transmits power, that is, power (current) is supplied from the substation to the transmission line, and "-" In the case of "", it means that the substation receives power, that is, power is supplied to the substation from the transmission line.

The section power calculation formula is defined for each pattern of power transmission / reception of the substation connected to the transmission line. In FIG. 5, AL1, AL2, BL1, and BL2 described in the section power calculation formula are the transmission power currently transmitted by the substation to the transmission line, or the received power currently received by the substation from the transmission line. Represents. Further, g1 to g4 described in the section power calculation formula represent the generated power of the generators 151 to 154 predicted by the power generation prediction device 103 (see FIGS. 2 and 3). The section power of each divided section can be calculated by adding these absolute values according to the pattern of power transmission / reception at the substation 104.

For example, consider the case where the substation A141 transmits power to the transmission lines 171 and 172 and the substation B142 receives power from the transmission lines 171 and 172. That is, consider the case where the power of the nodes AL1 and AL2 is "+" and the power of the nodes BL1 and BL2 is "-". In this case, the section power calculation formula for each divided section is No. 5 in FIG. Defined in 1. For example, the section power of the transmission section (section g1 to g2) between the generator 151 and the generator 152 in the transmission line 171 shown in FIG. 4 is the power AL1 supplied from the substation A141 to the transmission line 171 and the power generation. It is calculated by the sum (AL1 + g1) of the predicted value g1 of the generated power of the machine 151. If there are multiple substations that receive power from one transmission line, the section power can be calculated by dividing the section power of the split section immediately before branching by the ratio of the current received power of the substation receiving power. Good.

FIG. 6 shows a determination threshold value set for each division section. In this example, 500 MW is set as the determination threshold value for the divided sections (transmission section) AL1 to g1, g1 to g2, g2 to BL1, BL2 to g4, g4 to g3, and g3 to AL2. The determination threshold value may be different for each division section. The overload determination unit 125 (see FIG. 3) compares the section power calculated for each division section with the determination threshold value set for each division section, and the division section in which the overload state occurs. Determine if exists.

FIG. 7 shows a numerical example of the section power. Here, consider the case where the substation A141 transmits power to the transmission lines 171 and 172, respectively. The data receiving unit 121 (see FIG. 3) acquires the current power transmission power of the node AL1 + 100 MW and the power transmission power of the node AL2 + 200 MW from the remote monitoring control device 101, and supplies the data storage unit 123 as substation power data. Remember. Further, the data receiving unit 121 has acquired the prediction result of the generated power of each generator for the next day from the power generation prediction device 103 on the previous day, and stores it in the data storage unit 123 as the power generation prediction data.

FIG. 8 shows a section power calculation formula in the example of FIG. 7, a calculation result, a determination threshold value, and a table summarizing the presence / absence of an overload situation. In the above case, the section power calculation unit 124 has the No. 5 in FIG. The section power of each divided section is calculated using the section power calculation formula of 1. When, for example, the data receiving unit 121 acquires new substation power data and stores it in the data storage unit 123, the section power calculation unit 124 reads the substation power data from the data storage unit 123. Further, the section power calculation unit 124 reads out the power generation prediction data in the time zone next to the time zone to which the current time belongs from the data storage unit 123. The section power calculation unit 124 applies the read substation power data and the power generation prediction data to the section power calculation formula, and calculates the section power (the predicted value thereof) of each divided section in the next time zone.

In the time zone next to the time zone to which the current time belongs, the section power calculation unit 124 has, for example, that the section power of the divided section of the nodes AL1 to g1 is 100 MW, the section power of the divided section of the nodes g1 to g2 is 200 MW, and the node g2 to g2. The calculation result that the section power of the partition section of BL1 is 300 MW is output. Further, in the next time zone, the section power calculation unit 124 has a section power of 600 MW for the divided section of the nodes BL2 to g4, 400 MW for the section power of the divided section of the nodes g4 to g3, and a section of the divided section of the nodes g3 to AL2. Outputs the calculation result that the power is 200 MW.

The overload determination unit 125 compares the section power of each divided section calculated by the section power calculation unit 124 with the determination threshold value. When the determination threshold value of each division section is 500 MW, the overload determination unit 125 determines that the section power (600 MW) of the division sections BL2 to g4 exceeds the determination threshold value (500 MW), and then determines that the interval power (600 MW) exceeds the determination threshold value (500 MW). It is judged that an overload state occurs in that section in the time zone of. For the other divided sections, since the section power is below the judgment threshold value, it can be judged that the overload state does not occur in the next time zone.

FIG. 9 shows the correspondence between the divided section and the generator that shuts off when an overload occurs. For example, the administrator uses the data input unit 122 (see FIG. 3) to provide information for setting the generator to be shut off when it is determined that an overload condition occurs and the shutoff order thereof in advance. It is input to the detection device 102. When the cutoff requesting unit 126 determines that an overload state occurs in any section, the cutoff requesting unit 126 refers to the information shown in FIG. 9, which generator is cut off, that is, which generator corresponds to the breaker. To "open".

The cutoff requesting unit 126 shuts off the generator through the remote monitoring control device 101 in the cutoff order set for each divided section until the overload state is resolved. When it is determined that an overload state occurs in the divided sections BL2 to g4, for example, the circuit breaker requesting unit 126 corresponds to the remote monitoring control device 101 in the order of the generators G4, G3, G2, and G1. It is required to control CB4, CB3, CB2, and CB1 to "open". The divided sections BL2 to g4 are included in the power transmission section of the power transmission line 172, and the generator (G1) 161 and the generator (G2) 162 are not directly connected to the power transmission line 172. If the interruptions of the generators 161 and 162 are not effective in eliminating the overload condition that occurs in the transmission line 172, those generators may be excluded from the interruption order.

The operation procedure is shown below. FIG. 10 shows an operation procedure at the time of interruption. An administrator or the like inputs various information (data) necessary for system operation by using the data input unit 122 (see FIG. 3) (step A1). In step A1, for example, information indicating a divided section in which a transmission section of a transmission line is divided by a power plant or a substation, information defining a section power calculation formula for each section, and information indicating a judgment threshold set for each section. , Information that specifies a generator to shut off when an overload condition occurs, information that indicates the shutoff order, and the like are input. The information input in step A1 is stored in the data storage unit 123.

The data receiving unit 121 acquires power generation prediction data from the power generation prediction device 103 (step A2). The data receiving unit 121 acquires power generation prediction data indicating the power generation prediction result for the next day from, for example, the power generation prediction device 103, and stores it in the data storage unit 123. Acquisition of power generation prediction data is carried out, for example, once a day. When the power generation prediction data generated by the power generation prediction device 103 is changed, the changed power generation prediction data is stored in the data storage unit 123 and used in the subsequent processing.

The data receiving unit 121 acquires the current substation power data of the substation from the remote monitoring control device 101 (step A3). The data receiving unit 121 periodically acquires the substation power data from the remote monitoring control device 101 and stores it in the data storage unit 123, for example, every time a predetermined time elapses.

The section power calculation unit 124 calculates the section power of each divided section by using the power generation prediction data acquired in step A2 and the substation power data acquired in step A3 (step A4). In step A4, the section power calculation unit 124 calculates the section power for each of the divided sections based on, for example, the power generation prediction data for the current day acquired on the previous day and the current substation power data. If there is a generator that has already been shut off, the section power calculation unit 124 excludes the generator and calculates the section power.

The overload determination unit 125 compares the section power of each division calculated in step A4 with the determination threshold value of each division section, and determines whether or not the section power is equal to or greater than the determination threshold value ( Step A5). The overload determination unit 125 determines that an overload state occurs in the divided section when there is a divided section in which the section power is equal to or higher than the determination threshold value. When it is determined that the section power is smaller than the determination threshold value, the process returns to step A3, and the next substation power data is acquired in step A3.

When the cutoff request unit 126 determines that an overload state occurs in step A5, the cutoff request unit 126 transmits a cutoff request to the remote monitoring control device 101 to shut off at least one of the generators connected to the transmission line (step A6). ). The cutoff request unit 126 transmits a cutoff request to the remote monitoring control device 101, for example, when the current time reaches the start time of the time zone in which the overload state is determined to occur. By shutting off the generator, the power supplied to the transmission line is reduced, and it is possible to avoid the occurrence of an overload state in advance. After that, the process returns to step A3, and the next substation power data is acquired in step A3.

The circuit breaker (generator) cut off according to the above procedure can be restored when it is determined that the overload state does not occur even when the power transmission from the generator to the transmission line is restarted. For example, if it is determined that the overload state does not occur even if the circuit breaker is re-introduced after the circuit breaker has been shut off, the circuit breaker requesting unit 126 of the circuit breaker has been cut off. The remote monitoring and control device 101 may be requested to be recharged.

FIG. 11 shows a procedure for restoring the circuit breaker. The section power calculation unit 124 determines whether or not there is a generator that is shut off (step B1). If there is no generator shut off, the process returns to step B1. When the section power calculation unit 124 determines that there is a generator that is shut off in step B1, the section power calculation unit 124 calculates the section power when the generator is restored, that is, the section power when the corresponding circuit breaker is “closed” ( Step B2). In step B2, the section power calculation unit 124 calculates the section power for the divided section including the generated power of the generator being cut off, for example, in the section power calculation formula.

The overload determination unit 125 determines whether or not the section power calculated in step B2 is equal to or less than the recovery threshold value related to the recovery of the generator (step B3). The recovery threshold value is set to a value slightly lower than the determination threshold value used for determining whether or not the overload state is present, for example. When the cutoff request unit 126 determines in step B3 that the section power is equal to or less than the recovery threshold value, the cutoff request unit 126 transmits a recovery request to the remote monitoring control device 101 and "closes" the circuit breaker corresponding to the generator being cut off. (Step B4). When the circuit breaker is "closed", power transmission from the generator to the transmission line is resumed.

If it is determined in step B3 that the section power is greater than the recovery threshold, the process returns to step B1. The section power calculation unit 124 executes step B2 every time, for example, new substation power data is obtained, and updates the section power calculation result. By doing so, when the overload state is resolved, the generator can be automatically returned to the power transmission system. The operator of the remote monitoring and control device 101 may manually return the cut-off generator to the power transmission system.

In the present embodiment, the transmission line overload detection device 102 acquires the prediction result of the generated power of the renewable energy from the power generation prediction device 103. The transmission line overload detection device 102 determines whether or not an overload state occurs by using the prediction result of the generated power for each divided section of the transmission line. In the present embodiment, the prediction result of the generated power of the renewable energy is used to determine whether or not an overload state occurs. By determining whether or not an overload state occurs using the prediction result, it is possible to detect that an overload state occurs before the overload state actually occurs. Therefore, even when the generated power of renewable energy suddenly increases, the occurrence of an overload state can be detected in advance, and situations such as damage to the transmission line and power failure can be prevented.

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and changes and modifications are made to the above-described embodiments without departing from the spirit of the present invention. Also included in the present invention.

In the above embodiment, the program can be stored and supplied to a computer using various types of non-transitory computer readable media. Non-transitory computer-readable media include various types of tangible storage media. Examples of non-temporary computer-readable media are magnetic recording media such as flexible disks, magnetic tapes, or hard disks, such as magneto-optical recording media such as magneto-optical discs, CDs (compact discs), or DVDs (digital versatile disks). Includes optical disk media such as, and semiconductor memories such as mask ROM (read only memory), PROM (programmable ROM), EPROM (erasable PROM), flash ROM, or RAM (random access memory). The program may also be supplied to the computer using various types of transient computer readable media. Examples of temporary computer-readable media include electrical, optical, and electromagnetic waves. The temporary computer-readable medium can supply the program to the computer via a wired communication path such as an electric wire and an optical fiber, or a wireless communication path.

For example, some or all of the above embodiments may also be described, but not limited to:

[Appendix 1]
A power generation prediction data acquisition means for acquiring power generation prediction data showing a prediction result of the amount of power generated by a generator that generates power using renewable energy and supplies power to a transmission line connected via a breaker.
Substation power data acquisition means for acquiring substation power data including data indicating the amount of power transmitted from the substation to the transmission line, and
Based on the power generation prediction data and the substation power data, the section power indicating the amount of power in each of the plurality of divided sections in which the transmission section of the transmission line is divided by the connection node of the generator. Section power calculation means for calculating data and
An overload detection device including an overload determining means for comparing the section power data with a threshold value set for each divided section and determining whether or not an overload state occurs for each of the divided sections. ..

[Appendix 2]
The overload detection device according to Appendix 1, wherein the power generation prediction data acquisition means acquires power generation prediction data that predicts the amount of power generated on the day before.

[Appendix 3]
The overload detection device according to Appendix 2, wherein the power generation prediction data acquisition means acquires the changed power generation prediction data when the prediction of the power generation amount of the generator is changed on the day.

[Appendix 4]
The section power calculation means is described in any one of Supplementary notes 1 to 3 for calculating the section power data according to the section power calculation formula defined according to the connection relationship between the substation and the generator to the transmission line. Overload detector.

[Appendix 5]
The overload detection device according to Appendix 4, wherein the section power calculation formula is defined for each pattern of power transmission / reception of power of a substation connected to the transmission line.

[Appendix 6]
A power generation prediction data acquisition means for acquiring power generation prediction data showing a prediction result of the amount of power generated by a generator that generates power using renewable energy and supplies power to a transmission line connected via a breaker.
Substation power data acquisition means for acquiring substation power data including data indicating the amount of power transmitted from the substation to the transmission line, and
Based on the power generation prediction data and the power transmission / reception power data, the section power indicating the amount of power in each of the plurality of divided sections in which the transmission section of the transmission line is divided by the connection node of the generator. Section power calculation means for calculating data and
An overload determining means for comparing the section power data with the threshold value set for each divided section and determining whether or not an overload state occurs for each of the divided sections.
A power transmission control device including a circuit breaker control means that controls the circuit breaker according to a determination result in the overload determination means.

[Appendix 7]
When the overload determining means determines that an overload state occurs, the circuit breaker control means shuts off a circuit breaker corresponding to at least one of the generators connected to the divided section determined to cause the overload state. The power transmission control device according to Appendix 6, wherein at least one of the generators is separated from the power transmission line.

[Appendix 8]
The power transmission control device according to Appendix 7, wherein the circuit breaker control means shuts off the circuit breaker in an order according to a predetermined priority.

[Appendix 9]
When the circuit breaker control means determines that an overload state does not occur when the circuit breaker is re-introduced after the circuit breaker has been shut off, the overload determining means said. The power transmission control device according to Appendix 7 or 8, wherein the circuit breaker that has been cut off is turned on again.

[Appendix 10]
The power transmission control device according to any one of Supplementary note 6 to 9, further comprising a power generation prediction device for generating the power generation prediction data.

[Appendix 11]
Predict the amount of power generated by a generator that uses renewable energy to generate electricity and supplies power to transmission lines connected via breakers.
Acquire substation power data including data indicating the amount of power transmitted from the substation to the transmission line.
Based on the power generation prediction data showing the prediction result of the power generation amount of the generator and the substation power data, each of the plurality of division sections in which the transmission section of the transmission line is divided by the connection node of the generator. , Calculate the section power data showing the amount of power in each divided section,
An overload detection method for comparing the section power data with a threshold value set for each divided section and determining whether or not an overload state occurs for each of the divided sections.

[Appendix 12]
Predict the amount of power generated by a generator that uses renewable energy to generate electricity and supplies power to transmission lines connected via breakers.
Acquire substation power data including data indicating the amount of power transmitted from the substation to the transmission line.
Based on the power generation prediction data showing the prediction result of the power generation amount of the generator and the substation power data, each of the plurality of division sections in which the transmission section of the transmission line is divided by the connection node of the generator. , Calculate the section power data showing the amount of power in each divided section,
The section power data is compared with the threshold value set for each divided section, and it is determined whether or not an overload state occurs for each of the divided sections.
A power transmission control method for controlling the circuit breaker according to a determination result of whether or not the overload state occurs.

[Appendix 13]
On the computer
Acquire power generation prediction data showing the prediction result of the amount of power generated by a generator that uses renewable energy to generate power and supplies power to transmission lines connected via a breaker.
Acquire substation power data including data indicating the amount of power transmitted from the substation to the transmission line.
Based on the power generation prediction data and the substation power data, the section power indicating the amount of power in each of the plurality of divided sections in which the transmission section of the transmission line is divided by the connection node of the generator. Calculate the data,
A program for comparing the section power data with the threshold value set for each divided section and executing a process of determining whether or not an overload state occurs for each of the divided sections.

[Appendix 14]
On the computer
Acquire power generation prediction data showing the prediction result of the amount of power generated by a generator that uses renewable energy to generate power and supplies power to transmission lines connected via a breaker.
Acquire substation power data including data indicating the amount of power transmitted from the substation to the transmission line.
Based on the power generation prediction data and the substation power data, the section power indicating the amount of power in each of the plurality of divided sections in which the transmission section of the transmission line is divided by the connection node of the generator. Calculate the data,
The section power data is compared with the threshold value set for each divided section, and it is determined whether or not an overload state occurs for each of the divided sections.
A program for executing a process of controlling the circuit breaker according to a determination result of whether or not the overload state occurs.

10: Overload detection device 11: Power generation prediction data acquisition means 12: Substation power data acquisition means 13: Section power calculation means 14: Overload determination means 20: Power transmission control device 21: Circuit breaker control means 101: Remote monitoring control device 102: Transmission line overload detection device 103: Power generation prediction device 104, 141, 142: Substation 105, 151-154: Circuit breaker 121: Data receiving unit 122: Data input unit 123: Data storage unit 124: Section power calculation unit 125: Overload determination unit 126: Cutoff request unit 161 to 164: Generator 171 and 172: Transmission line

Claims (10)

A power generation prediction data acquisition means for acquiring power generation prediction data showing the prediction result of the generated power of a generator that generates power using renewable energy and supplies power to a transmission line connected via a breaker.
Substation power data acquisition means for acquiring substation power data including data indicating the power transmitted from the substation to the transmission line, and
Based on the power generation prediction data and the substation power data, for each of the plurality of division sections in which the transmission section of the transmission line is divided by the connection node of the generator, the section power indicating the power of each division section is calculated. Section power calculation means to calculate and
An overload detecting device including an overload determining means for comparing the section power with a threshold value set for each divided section and determining whether or not an overload state occurs in each of the divided sections. The overload detection device according to claim 1, wherein the section power calculation means calculates the section power according to a section power calculation formula defined according to the connection relationship between the substation and the generator to the transmission line. The overload detection device according to claim 2, wherein the section power calculation formula is defined for each pattern of power transmission / reception of power of a substation connected to the transmission line. A power generation prediction data acquisition means for acquiring power generation prediction data showing the prediction result of the generated power of a generator that generates power using renewable energy and supplies power to a transmission line connected via a breaker.
Substation power data acquisition means for acquiring substation power data including data indicating the power transmitted from the substation to the transmission line, and
Based on the power generation prediction data and the substation power data, for each of the plurality of division sections in which the transmission section of the transmission line is divided by the connection node of the generator, the section power indicating the power of each division section is calculated. Section power calculation means to calculate and
An overload determining means for comparing the section power with the threshold value set for each divided section and determining whether or not an overload state occurs for each of the divided sections.
A power transmission control device including a circuit breaker control means that controls the circuit breaker according to a determination result in the overload determination means. When the overload determining means determines that an overload state occurs, the circuit breaker control means shuts off a circuit breaker corresponding to at least one of the generators connected to the divided section determined to cause the overload state. The power transmission control device according to claim 4, wherein at least one of the generators is separated from the power transmission line. The power transmission control device according to claim 5, wherein the circuit breaker control means shuts off the circuit breaker in an order according to a predetermined priority. When the circuit breaker control means determines that an overload state does not occur when the circuit breaker is re-introduced after the circuit breaker has been shut off, the overload determining means said. The power transmission control device according to claim 5 or 6, wherein the circuit breaker that has been cut off is turned on again. The power transmission control device according to any one of claims 4 to 7, further comprising a power generation prediction device that generates the power generation prediction data. Predict the power generated by a generator that uses renewable energy to generate electricity and supplies power to transmission lines connected via circuit breakers.
Acquire substation power data including data indicating the power transmitted from the substation to the transmission line.
Based on the power generation prediction data showing the prediction result of the generated power of the generator and the substation power data, for each of the plurality of divided sections in which the transmission section of the transmission line is divided by the connection node of the generator. Calculate the section power indicating the power of each divided section,
An overload detection method for comparing the section power with a threshold value set for each divided section and determining whether or not an overload state occurs for each of the divided sections. On the computer
Acquire power generation prediction data showing the prediction result of the generated power of the generator that generates power using renewable energy and supplies power to the transmission line connected via the breaker.
Acquire substation power data including data indicating the power transmitted from the substation to the transmission line.
Based on the power generation prediction data and the substation power data, for each of the plurality of division sections in which the transmission section of the transmission line is divided by the connection node of the generator, the section power indicating the power of each division section is calculated. Calculate and
A program for comparing the section power with the threshold value set for each divided section and executing a process of determining whether or not an overload state occurs in each of the divided sections.

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